Time for draining water from a gas boiler when it is shut down
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It is planned to use residual heat for drying after shutting down the furnace. Can all the water be drained immediately after shutdown? If drainage is delayed, the effect of drying with residual heat will be poor
After the furnace is shut down, the fan will continue to blow air for some time, until the pressure in the furnace drops. I’m not sure what the pressure level is where you are; it’s recommended to wait until it falls below 0.2 MP before releasing the pressure. If you think this process is too slow, you can increase the flow rate of the drainage system, but keep it at a low level. Once the pressure has dropped, you can then release the pressure. Another option is to reduce the load to its minimum level, allowing water to keep flowing out; wait until the water level drops to a low level, and then turn off the burner. Remember to disable the interlock mechanism – it’s really difficult to determine the exact timing for this.
The back flushing of the fan takes a little over a minute, and it doesn’t seem to have much effect on cooling
That’s not for cooling; it’s used to blow away the remaining gas in the furnace